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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Segment Reporting Information [Line Items]          
Revenues $ 256,914 $ 205,677 $ 500,756 $ 403,977  
Cost of services 213,679 171,837 415,920 337,073  
Gross profit 43,235 33,840 84,836 66,904  
Selling, general and administrative expenses 35,070 29,647 67,156 59,736  
Contingent consideration (149) 71 (115) 71  
Loss (gain) on sale of assets 98 (20) 95 (34)  
Operating income (loss) 8,216 4,142 17,700 7,131  
Depreciation and amortization expense 2,474 2,061 4,846 4,269  
Capital expenditures 1,841 1,124 3,929 2,327  
Total assets 417,271 384,987 417,271 384,987 $ 421,994
Commercial & Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 79,975 65,589 152,558 118,591  
Cost of services 71,184 59,068 135,092 107,227  
Gross profit 8,791 6,521 17,466 11,364  
Selling, general and administrative expenses 7,363 6,849 14,079 12,644  
Loss (gain) on sale of assets (1) (17) (4) (29)  
Operating income (loss) 1,429 (311) 3,391 (1,251)  
Depreciation and amortization expense 629 527 1,255 1,084  
Capital expenditures 615 413 1,467 923  
Total assets 77,898 72,559 77,898 72,559  
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 70,437 50,244 139,762 104,703  
Cost of services 58,492 40,892 115,851 86,231  
Gross profit 11,945 9,352 23,911 18,472  
Selling, general and administrative expenses 7,666 6,201 14,600 12,285  
Loss (gain) on sale of assets 0 (8) 0 (9)  
Operating income (loss) 4,279 3,159 9,311 6,196  
Depreciation and amortization expense 426 219 841 435  
Capital expenditures 193 398 693 473  
Total assets 91,960 60,102 91,960 60,102  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 34,450 23,866 63,929 45,551  
Cost of services 27,004 18,842 50,556 35,842  
Gross profit 7,446 5,024 13,373 9,709  
Selling, general and administrative expenses 4,685 4,637 9,166 9,194  
Contingent consideration (149) 71 (115) 71  
Loss (gain) on sale of assets 101 6 101 5  
Operating income (loss) 2,809 310 4,221 439  
Depreciation and amortization expense 1,175 1,140 2,269 2,383  
Capital expenditures 635 205 822 345  
Total assets 114,739 100,884 114,739 100,884  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 72,052 65,978 144,507 135,132  
Cost of services 56,999 53,035 114,421 107,773  
Gross profit 15,053 12,943 30,086 27,359  
Selling, general and administrative expenses 11,187 9,688 22,324 20,054  
Loss (gain) on sale of assets (2) (1) (2) (1)  
Operating income (loss) 3,868 3,256 7,764 7,306  
Depreciation and amortization expense 217 155 426 296  
Capital expenditures 398 108 845 586  
Total assets 55,417 47,695 55,417 47,695  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 0      
Cost of services 0 0      
Gross profit 0 0      
Selling, general and administrative expenses 4,169 2,272 6,987 5,559  
Loss (gain) on sale of assets 0 0      
Operating income (loss) (4,169) (2,272) (6,987) (5,559)  
Depreciation and amortization expense 27 20 55 71  
Capital expenditures 0 0 102 0  
Total assets $ 77,257 $ 103,747 $ 77,257 $ 103,747